An anonymous reader writes: With the latest update to the MSN Instant Messenger client, now called Windows Live Messenger, Microsoft has required all users to sign a new contract which among other things forbids the use of 3rd party instant messenger clients to connect to the MSN messenger service, such as the AJAX Meebo client, Gaim, and Trillian among others. Worth noting, they do provide a list of authorized 3rd party clients, such as Yahoo Messenger, that are allowed access to the service.

Excerpt:
"In using the service, you may not use any unauthorized third party software or service to access the Microsoft instant messaging network currently known as the.NET Messenger service."